German Preeflow coupling Preeflow model Preeflow price

Preeflow couplings are mechanical components used to connect two shafts (driving shaft and driven shaft) in different mechanisms, enabling them to rotate together to transmit torque. In high-speed, heavy-load power transmission systems, some couplings also provide buffering, vibration damping, and improved dynamic performance of the shaft system. A coupling consists of two halves, each connected to the driving shaft and the driven shaft respectively. Generally, prime movers are connected to working machines via couplings.

Preeflow coupling structure and features

A diaphragm coupling consists of at least one diaphragm and two hubs. The diaphragm is fastened to the hubs with pins and generally does not loosen or cause backlash between the diaphragm and the hubs. Some manufacturers offer versions with two diaphragms, while others offer three diaphragms, with one or two rigid elements in the middle, connected to the hubs on both sides. The difference between single-diaphragm and double-diaphragm couplings lies in their ability to handle various misalignments. Since single-diaphragm couplings require complex bending of the diaphragm, they are less suitable for eccentric misalignment. Double-diaphragm couplings can bend in different directions simultaneously, thereby compensating for eccentricity. Features: This characteristic of diaphragm couplings is somewhat similar to bellows couplings; in fact, the torque transmission method is quite similar. The diaphragm itself is very thin, so it bends easily when subjected to relative displacement loads, allowing it to accommodate misalignments of up to 1.5 degrees while generating lower bearing loads in servo systems. Diaphragm couplings are commonly used in servo systems. The diaphragm offers good torsional stiffness, though slightly inferior to that of bellows couplings. On the other hand, diaphragm couplings are very delicate and can be easily damaged if misused or improperly installed. Therefore, it is essential to ensure that misalignment remains within the normal operating tolerance of the coupling. Selecting the appropriate coupling is a key step in using couplings effectively; the type of coupling should be considered during the design phase. Compared with gear couplings, diaphragm couplings have no relative sliding, require no lubrication or sealing, produce no noise, basically require no maintenance, are easy to manufacture, and can partially replace gear couplings.

Preeflow coupling abnormal noise troubleshooting

1) The gap between the two coupling halves is too wide, causing significant axial force on the diaphragm, which leads to wear on the reamed holes or reamed bolts, resulting in abnormal noise; 2) Excessive axial offset or angular misalignment between the two coupling halves can also cause vibration and abnormal noise during equipment operation; 3) Differences in speed between the driving end and the driven end can also cause vibration and abnormal noise during equipment operation; 4) A fault in the motor's speed encoder causes fluctuating motor speeds, leading to abnormal noise in the diaphragm coupling.

Preeflow coupling installation and maintenance

Installation and removal: 1) Wipe clean any dust and dirt from the installation shaft surface, and apply a thin layer of machine oil or lubricant. 2) Clean the inner bore of the LingSi coupling and apply machine oil or lubricant. 3) Insert the LingSi coupling onto the installation shaft; if the fit is tight, avoid striking it with an iron hammer or hard metal during installation. 4) After positioning, first tighten the screws gently in a diagonal pattern using a torque wrench (specified tightening torque 1/4). 5) Increase the force (to 1/2 of the specified tightening torque) and repeat the action in step 4. 6) Tighten and secure according to the specified tightening torque. 7) Finally, tighten the securing screws sequentially in a circular direction. 8) During removal, ensure the device is completely stopped; loosen the locking screws sequentially. Maintenance methods: 1) Before installation, clean the ends of both shafts and check the fit of keyways and other mating surfaces; 2) After installing the diaphragm coupling, operate normally for one shift, then check all screws. If any are loose, tighten them. Repeat this process several times to ensure they do not loosen; 3) To prevent fretting wear of the diaphragm during high-speed operation, which can cause micro-cracks in the diaphragm bolt holes and lead to damage, apply solid lubricants such as molybdenum disulfide between the diaphragms or apply an anti-wear coating to the diaphragm surface; 4) Avoid long-term overload operation and operational accidents with the diaphragm coupling; 5) During operation, regularly check the diaphragm coupling for any abnormalities. If any occur, perform maintenance immediately; 6) Appropriate safety measures must be taken in all locations where personnel and equipment accidents could occur due to the operation of the diaphragm coupling.

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